COSMOVIA - Virtual Institute of Astroparticle Physics /IN THE NEWS /INDICATION OF ELECTRON NEUTRINO APPEARANCE FROM AN ACCELERATOR PORDUCED OFF-AXIS MUON NEUTRINO BEAM.

Credits

T2K Collaboration: K.Abe (49), N.Abgrall (16), Y.Ajima (18), H.Aihara
(48), J.B.Albert (13), C.Andreopoulos (47), B.Andrieu (37), M.D.Anerella (6),
S.Aoki (27), O.Araoka (18), J.Argyriades (16), A.Ariga (3), T.Ariga (3),
S.Assylbekov (11), D.Autiero (32), A.Badertscher (15), M.Barbi (40),
G.J.Barker (56), G.Barr (36), M.Bass (11), F.Bay (3), S.Bentham (29),
V.Berardi (22), B.E.Berger (11), I.Bertram (29), M.Besnier (14), J.Beucher
(8), D.Beznosko (34), S.Bhadra (59), F.d.M.Blaszczyk (8), A.Blondel (16),
C.Bojechko (53), J.Bouchez (8, deceased), S.B.Boyd (56), A.Bravar (16),
C.Bronner (14), D.G.Brook-Roberge (5), N.Buchanan (11), H.Budd (41), D.Calvet
(8), S.L.Cartwright (44), A.Carver (56), R.Castillo (19), M.G.Catanesi (22),
A.Cazes (32), A.Cervera (20), C.Chavez (30), S.Choi (43), G.Christodoulou
(30), et al. (364 additional authors not shown)

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Indication of Electron Neutrino Appearance from an Accelerator-produced Off-axis Muon Neutrino Beam.

June 14, 2011

The T2K experiment observes indications of $\nu_\mu\rightarrow \nu_e$
appearance in data accumulated...

The T2K experiment observes indications of $\nu_\mu\rightarrow \nu_e$ appearance in data accumulated with $1.43\times10^{20}$ protons on target. Six events pass all selection criteria at the far detector. In a three-flavor neutrino oscillation scenario with $|\Delta m_{23}2|=2.4\times10^{-3}$ eV$^2$, $\sin2 2\theta_{23}=1$ and $\sin2 2\theta_{13}=0$, the expected number of such events is 1.5$\pm$0.3(syst.). Under this hypothesis, the probability to observe six or more candidate events is 7$\times10^{-3}$, equivalent to 2.5$\sigma$ significance. At 90% C.L., the data are consistent with 0.03(0.04)$<\sin2 2\theta_{13}<$ 0.28(0.34) for $\delta_{\rm CP}=0$ and normal (inverted) hierarchy. \\ ( http://arxiv.org/abs/1106.2822 , 180kb)